Master starter cable



Aug. 23, 1949- F. HERBERT 2,479,834

MASTER STARTER CABLE Filed Aug. 31, 1948 FIE-E INVENTOR. FREDERICK HERBERT 7/Z mwflmnmz Wm ATTOQNEYS Pltented Aug. as, 1949 UNITED STATESPATENT GFFICE MASTER sun-ran can:

Frederick Herbert, New Orleans, La. Application August :1, 1948, SerialNo. 46,998

1 Claim. 1

This invention relates to electric cables, and more particularly to aninsulated master starter cable combined with a renewable fuse.

The main object of my invention is to provide a special master startercable including intermediate the terminals thereof a fuse casingcontaining a fuse in the form of a renewable strip.

Another object is to have a detachable fuse casing which is preferablyof transparent insulating material to visually indicate the condition ofthe fuse within.

A further object is to provide a master starter cable of the indicatedcharacter with a fuse casing in which it is possible to renew the fuseand thereby restore the cable to pristine condition when the fuse hasblown.

It is also an object to produce a combined master cable and fuse ofsimple, durable and effective construction.

Other objects and advantages of the invention will appear in furtherdetail as the specification proceeds.

In order to facilitate ready comprehension of this invention for aproper appreciation of the salient features thereof, the invention isillustrated on the accompanying drawing forming a part hereof, and inwhich:

Figure 1 is an elevation of a master cable and a fuse made according tothe invention and embodying the same in a practical form;

Figure 2 is a longitudinal section taken on line 2-2 in Figure 1;

Figure3isapartialsectiontakenonline3-2 in Figure 1.

In the views the same reference numerals indicate the same parts.

In electrical installations on power switchboards and the like, cablesare frequently used for various connections, and particularly inconnection with controls for large motors, master starter cables areemployed. It has been usual to install fuses in connection with starterand switch boxes and the like, but this does not always serveconveniently, for the common cartridge fuses may or may not be of suchtype as to indicate when they are blown, and occasionally the locationof the fuses is not convenient for instant renewal thereof. On the otherhand, it is dsirable, when possible, not only to shorten leads and savespace to reduce resistance, but also to locate fuses as close toelectrical apparatus as possible in the conducting lines supplying theelectric current thereto. After considering this problem, it hasoccurred to me that a master cable leading to the electrical apparatusto be supplied with current can well be combined with a renewable fuse,as will now be particularly described.

Hence, in the practice of my invention, and referring again to thedrawing, the master cable, generally indicated at I, has an eye terminal5 with an aperture 6 through which a connecting pin or bolt may bethreaded, while at the other end this terminal has a socket 1 into whichthe bare end 8 of a conductor cable is fitted, and preferably soldered,in place at 9. The cable is preferably insulated, as indicated at l0,and at the other end II the metal wires of the cable are again exposedand soldered in place at 12 within the rear end of a connecting sleevel3. The forward end ll of this sleeve is internally threaded and intothis threaded end It is screwed one threaded and II of a heavy glass orother insulating tube It. The other end 11 of tube It is likewisethreaded and screwed into a threaded socket I8 of a clamp terminal ithaving a terminal aperture 20 for engaging about a binding post orsimilar connection, the cable terminal is having two clamping portions2!, 22 provided with transverse apertures 23 (one shown in Figure 2),through which a clamping bolt 24 extends having a nut 25 screwed thereonfor tightening the clamping members 2| and 22 and thereby gripping thebinding post or other connection in the aperture 20 with which theterminal may be connected.

The glass or other insulating tube It has a narrow hole 26 extendingaxially through the tube from end to end and loosely mounted within thisaperture or hole is a metal strip of fuse 21 extending beyond the ends28 and 29 of tube it and bent at 30, 3| to form strip terminals clampedbetween the ends 28 and 29 of the tube and the end ll of the cablewithin socket l3 at one end and end wall 32 of terminal I! withinthreaded socket ll. The result is that the strip 21 by its ends 30, 3|connects the cable end H with terminal I! through the end wall 32thereof. Obviously, the fuse is readily seen through the glass wall oftube l6 so that its condition may be inspectcd at any time, and when ithas blown, it

4 is a simple matter to unscrew the tube It from 56 parts and featuresmay be modified or used with- 7 3 out others within the scope of theappended cla 1-2":

Having now fully described my invention, i claim:

In a fuse for an internally threaded metal socket terminating internallyin an end wall and forming a cable terminal, an internally threadedconnecting sleeve mounted upon one end of an electric cable inelectrical contact with the same and having the internally threaded endof the connecting sleeve extending beyond the cable, and a removablefuse strip for interconnecting thecable and the metal socket, theimprovement which includes a tube of insulating material having an axialbore of very small caliber with re spect to the cross-section of thetube and being externally threaded upon both ends with one threaded endfitting into the internally threaded socket and one end of the fusestrip bent transversely of the boreupon said one threaded end andconfined between the latter and the end wall in said socket, andtheother threaded end of said tube fitting into the projectinginternally threaded end of the connecting sleeve with the other end ofaeteeee seld fuse strip also tent transversely of said re beyond theothei end of said tubeand I ed between the latter end and the end ofsaid cable extending into said connecting sleeve.

REFERENQES (CZIEEED The following references are of record in the fileof this patent:

